Burglar lock for revolving doors



D. H. CLOSE.

BURGLAB LOOK FOR REVOLVING DOORS.

APPLICATION FILED DEC- 14. I920.

2. :E J m w N 1m Mm m 0 mm Q t O o INVENTOR. flflfllfi'e ATTORNEY.

D. H. CLOSE. BURGLAR LOCK FOR REVOLVING DOORS.

APPLICATION FILED DEC. 14, 1920.

Patented Nov. 7, 1922 2 SHEETSSHEET 2.

III

INVENTOR.

' ATTORNEY.

Patented Nov. if, i922.

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BURGLAE LOCK FOE REVOLVING DOORS.

Application filed December is, 1920. Serial no. 430544..

1 0 all whom it may concern;

Be it known that l, DANIEL H. those, a citizen .of the United States, residing at Keyport, in the county of hlonmouth and the State of New Jersey, have invented cer tain new and useful Im n'ovements in Enrglar Locks for Revolving Doors, of which the following is a specification.

This invention relates to a protective device for banks, trust companies, Jewelers, etc. the object of the device being to entrap in the building, bank or store, any person or present invention contemplates the locking of said door through electrical means from one or more places located within the building, the door when so locked remaining in locked condition during a certain period of time regulated by the running of a clock mechanism with which is combined a disc normally covering a key-hole but uncovering said key-hole at certain definite intervals of time, as for example every fifteen minutes, the locking means being releasable only during alignment of a key-hole in the disc with one in the door of the lock containing casing.

With this general statement of the object of the invention the details ofconstruction' will be readily understood as shown in the accompanying drawings, in which:

Figure 1 is a top plan view of the door, the wall of the building adjacent the entrance being shown in section.

Figure 2 is an elevation of the upper inner portion of the door, parts being broken away and in section.

Figure 3 is an enlarged detail sectional view showing the bolt holding and releasing means.

Figure 4 is a section on the line 4-4: of Fig. 2.

Figure 5 is a rear face view of a key-hole guard or disc.

In the drawings A designates the vestitrance B is placed Electr c-magnets adapted to be controlled by bul e or approachtothe door and B the entrance way into the building, flanked by the usual curved partitions C employed with doors of the revolving type. In the enthe door 1 braced as at 2 and provided with bars or other form of gratmg 3. On the top of the door, supported on its wings, I place a steel band 4, perforated as at 5 and provided witha number of stop blocks 6.

Above the door and supported, on the partitions G is a steel b0); or casing 7, the in nor side of which is hinged to swing open and give access to the interior, but normally locked. .VVithin this case are one or more bolts 8 having each a collar 8 and adapted to be forced downwardly by a coil spring 9, bearing against a partition 10 and the collar, respectively, the bolt being mounted to work in the partition and in and through the bottom of the casing.

11 are placed adjacent each bolt, and are provided with armatures, 12 having stems 13 that normally engage the underside of the collars 8 and hold the bolts from engag ment with the band 41-. In practice a bolt will be arranged on opposite sides of the door, an electromag net being placed in the casing above each of the partitions C, but the device might be operated with one bolt only if desired.

An electric circuit normally open but a switch E controls the magnets. In practice the switch will be of the push button type, and the circuit may be arranged so that it may be closed at two or more points in the building.

The casing is provided with key-hole 7 any form of lock being used, and on the innor face of the casing is placed a disc 14: normally covering the key-hole 7*, but provided with a number of slots 15, preferably about four in number, adapted to align successively with the key-hole on rotation of the disc.

A clock 16 is mounted in the casing '7 and on its rear face carries a wheel 17 making one complete rotation each hour. A. similar wheel is fixed on the disc shaft as at 18 and a belt or chain 19 connects the two wheels. This gives the disc a rotation once each hour, and if there are four slots 15 the key-hole 7 will be uncovered each fifteen minutes. This disc may rotate continuously with the clock or the latter may be started electrically being put into the circuit D, in which case the face or dial would be dispensed with, and the disc lt would start to rotate only on closing of the circuit D and it would be fifteen minutes from the time the circuit was closed before the casing 4: could be opened and the bolts 8 lifted, this last operation being performed by hand.

The operation may be briefly summed up follows :If any attempt is made to hold up the employees, or other persons in the building the closing of the circuit D by merely pressing a button will retract the armatm'es -3 and allow the bolts 8 to spring into engagement with the band. l. If a bolt should fail to enter one of the openings 8 it would still fall su'liiciently' to lie in the path of the perpendicular end of the lug 6 nearest the opening missed by the bolt and would be struck by-said end of the lug, as indicated in Figure 3, and further rotation of the door would be stopped until the bolt had been lifted to allow the lug to pass under it, it being understood. that the door is so mounted. as to rotate in one direction only.

The door cannot therefore be revolved to permit any one to leave the building until the disc 14: comes into such position that one of the slots 15 will. register with a keyhole in the casing. Only during registration of a slot 15 with the'keyhole 7 can access to the casing be had to unlock the door 1.

This will give ample time to telephone or otherwise signal the proper authorities and for assistance to arrive.

In the case of a bank the mere fact that the door had been locked during banking hours would of itself spread an alarm even if those inside were prevented from giving one.

From the drawing and the above description it is thought that the invention will be clearly understood.

I do not wish to be limited to any particular clock device and have not therefore described in details the cloclr'mechanism as it. does not form a part of this invention.

V] hat I claim is 1. The combination with a revolving door, a metal band carried by the door top and suitably perforated, bolts adapted to drop into said perforations, an eleetromagnet for each bolt having an armature normally holding the bolt in elevated position, a normally open circuit in which said magnets are placed, and time controlled means controlling access to said bolts.

2. The combination. with a revolving door, a metal plate carried by the door top and having bolt engaging means, a casing arranged above the door and having a hinged side member normally locked, bolts arranged in the casing and adapted to wore: through the casing bottom and engage said plate, and a clock mechanism in the casing and controlling the period of time during which the casing may be unlocked.

3. The combination with a revolving door, of a casing placed above the door, door locking means arranged partly on the top of the door and in said casing, electro-n'iagnetic means for controlling locking of the door, said casing having a hinged and normally locked member giving access when in open position to the casing for resetting the looking means, said hinged member having a key-hole therein, a disc in the casing normally covering said key-hole, and having slots adapted to successively register with the keyhole, and a clock mechanism for rotating said disc.

In testimony whereof I'afii'x my signature.

DANIEL H. CLOSE. 

